What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
When coding the detailed nature of participants, use your personal knowledge about the participants, if you are completely confident of the accuracy of your knowledge, even if the specific information is not in the opinion. For example, if "IBM" is listed as the appellant it could be classified as "clearly national or international in scope" even if the opinion did not indicate the scope of the business. 

Your task concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)". Your task is to determine what category of business best describes the area of activity of this litigant which is involved in this case.

Opinion:
GREAT NORTHERN RAILWAY COMPANY, a corporation, Appellant, v. LUMBER AND SAWMILL WORKERS, LOCAL UNION NO. 2409, a Voluntary Association and Labor Union et al., Appellees.
No. 14934.
United States Court of Appeals Ninth Circuit.
April 18, 1956.
Weir, Gough & Matson, Taylor B. Weir, Newell Gough, Jr., Enor K. Matson, Helena, Mont., for appellant.
Leif Erickson, Helena, Mont., for appellees.
Before STEPHENS and BONE, Circuit Judges, and GOODMAN, District Judge.
GOODMAN, District Judge.
The District Court, on motion of defendant below (appellee here) dismissed plaintiff’s (appellant’s) cause of action for a permanent .and temporary injunction restraining appellee from picketing on or about appellant’s railroad right-of-way and from delaying or interfering with appellant’s delivery of freight to a Mill, with which appellee was engaged in a labor dispute.
District Judge Murray, in his opinion below, 140 F.Supp. 393, has set out adequate and compelling reasons why the complaint failed to tender sufficient legal grounds for injunctive relief. Upon his opinion, the judgment below should be affirmed.
Appellant has urged us, nevertheless, to reverse upon the broad ground that appellant is entitled to injunctive relief to enable it to comply with its obligations to furnish interstate railway service to all the public, 49 U.S.C.A. § 1(17), including shippers involved in labor disputes. The resolution of such an issue necessarily involves the application of the Norris-La Guardia Act, 29 U.S.C.A. §§ 104-113 and the Labor Management Relations Act, 29 U.S.C.A. § 141 et seq.
The District Court felt it unnecessary, as we do, to reach this question. For the facts of this case, as alleged in the complaint, and, deemed true for the purposes of the motion to dismiss, do not present a cause of equitable relief under well recognized legal doctrine. The acts of appellee complained of have been continuing since January 1, 1954. The complaint was not filed until September 14, 1955. So the appellant was allegedly suffering under a burden for twenty months before suit, a burden which, suddenly, after that long period of time blossomed into a claimed need for immediate drastic remedy. Furthermore, it appeared that the extent of the hindrance to appellant was merely that it had to use other than regular employees to deliver the freight — a detriment easily and admittedly compensable in dollars. Indeed the allegations of the complaint affirmatively show that the appellant in fact was not prevented from making any deliveries of freight.
Under these circumstances, to reach and rule upon the broad question tendered by appellant would amount to the issuance of an advisory opinion. This is a “consummation” devoutly to be avoided, for that is the way bad law is made.
Affirmed.

Question: This question concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)". What category of business best describes the area of activity of this litigant which is involved in this case?

Choices:
agriculture
mining
construction
manufacturing
transportation
trade
financial institution
utilities
other
unclear

Answer: 4