Steam Locomotive Design: http://www.steam-loco-design.co.uk/; contact ian.gaylor@steam-loco-design.co.uk
Girdlestone & Associates: http://www.pgrail.co.za/; contact pgrail@venturenet.co.za
Shaun McMahon: contact engineer@arnet.com.ar; see also http://www.martynbane.co.uk/modernsteam/smcmahon/smcmahon.htm
Nigel Day: contact Nigelsteamday@aol.com [see brochure]; see also http://www.martynbane.co.uk/modernsteam/nday/nigeldayhome.htm
DLM: http://www.dlm-ag.ch/; contact Roger Waller at roger.waller@dlm-ag.ch
Vapor Locomotive Company: www.vaporlocomotive.com; contact Matt Janssen at mjanssen@vaporlocomotive.com.
Interlok: http://www.interlok.info/indexe.htm