EX-10.6



 Exhibit 10.6 

THIS PROMISSORY NOTE (“NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS
BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED. 
 PROMISSORY NOTE 
  

			
	Principal Amount: up to $300,000	  	Dated as of November 10, 2017
	(as set forth on the Schedule of Borrowings attached hereto)	  	

 Iron Horse Acquisition Corp., a Cayman Islands exempted company and blank check company (the
“Maker”), promises to pay to the order of Cerberus Iron Horse Holdings, LLC, a Delaware limited liability company, or its registered assigns or successors in interest (the “Payee”), or order, the principal sum of up
to three hundred thousand U.S. dollars ($300,000) (as set forth on the Schedule of Borrowings attached hereto) in lawful money of the United States of America, on the terms and conditions described below. All payments on this Note shall be made by
check or wire transfer of immediately available funds or as otherwise determined by the Maker to such account as the Payee may from time to time designate by written notice in accordance with the provisions of this Note. 

1. Principal. The principal balance of this Note shall be payable on the earlier of: (i) March, 30, 2018 or (ii) the date on
which Maker consummates an initial public offering of its securities. The principal balance may be prepaid at any time. 
 2. Interest.
No interest shall accrue on the unpaid principal balance of this Note. 
 3. Application of Payments. All payments shall be
applied first to payment in full of any costs incurred in the collection of any sum due under this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of
the unpaid principal balance of this Note. 
 4. Events of Default. The following shall constitute an event of default (“Event
of Default”): 
 (a) Failure to Make Required Payments. Failure by Maker to pay the principal amount due pursuant to
this Note within five (5) business days of the date specified above. 
 (b) Voluntary Bankruptcy, Etc. The commencement by Maker
of a voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian,
sequestrator (or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the
taking of corporate action by Maker in furtherance of any of the foregoing. 
 (c) Involuntary Bankruptcy, Etc. The entry of a decree
or order for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee,
sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and
in effect for a period of 60 consecutive days. 
  







 5. Remedies. 

(a) Upon the occurrence of an Event of Default specified in Section 4(a) hereof, Payee may, by written notice to Maker, declare this Note
to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable thereunder, shall become immediately due and payable without presentment, demand, protest or other notice of any kind, all of which
are hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding. 
 (b) Upon
the occurrence of an Event of Default specified in Sections 4(b) and 4(c), the unpaid principal balance of this Note, and all other sums payable with regard to this Note, shall automatically and immediately become due and payable, in all cases
without any action on the part of Payee. 
 6. Waivers. Maker and all endorsers and guarantors of, and sureties for, this Note waive
presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all benefits that might
accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any stay of
execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof, on any writ of execution issued hereon, may be sold upon any
such writ in whole or in part in any order desired by Payee. 
 7. Unconditional Liability. Maker hereby waives all notices in
connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any
manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the
payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s liability hereunder. 

8. Notices. All notices, statements or other documents which are required or contemplated by this Agreement shall be: (i) in
writing and delivered personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing, (ii) by facsimile to the number most recently provided
to such party or such other address or fax number as may be designated in writing by such party and (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic mail address as may be
designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following receipt of written confirmation, if sent by
facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail. 

9. Construction. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF NEW YORK, WITHOUT REGARD TO CONFLICT OF LAW
PROVISIONS THEREOF. 
 10. Severability. Any provision contained in this Note which is prohibited or unenforceable in any jurisdiction
shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction. 

  
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 11. Trust Waiver. Notwithstanding anything herein to the contrary, the Payee hereby waives
any and all right, title, interest or claim of any kind (“Claim”) in or to any distribution of or from the trust account to be established in which the proceeds of the initial public offering (the “IPO”) conducted
by the Maker (including the deferred underwriters discounts and commissions) and the proceeds of the sale of the warrants issued in a private placement to occur prior to the effectiveness of the IPO are to be deposited, as described in greater
detail in the registration statement and prospectus to be filed with the Securities and Exchange Commission in connection with the IPO, and hereby agrees not to seek recourse, reimbursement, payment or satisfaction for any Claim against the trust
account for any reason whatsoever. 
 12. Amendment; Waiver. Any amendment hereto or waiver of any provision hereof may be made with,
and only with, the written consent of the Maker and the Payee. 
 13. Assignment. No assignment or transfer of this Note or any rights
or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without the prior written consent of the other party hereto and any attempted assignment without the required consent shall be void. 

[Signature page follows] 

  
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 IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note to
be duly executed by the undersigned as of the day and year first above written. 
  

			
	 IRON HORSE ACQUISITION CORP.

a Cayman Islands exempted company

		
	By:	 	 /s/ Steven F. Mayer

		 	Name: Steven F. Mayer
		 	Title:  Chief Executive Officer









 SCHEDULE OF BORROWINGS 

The following increases or decreases in this Promissory Note have been made: 
  

							
	 	  	Amount of decrease in	  	Amount of increase in	  	Principal Amount of this
	Date of Increase or	  	Principal Amount of this	  	Principal Amount of this	  	Promissory Note following
	 Decrease
	  	 Promissory Note
	  	 Promissory Note
	  	 such decrease or increase



 

  
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