41 C.F.R. § 301-10.161 What class of train accommodations must I use?
Title 41 - Public Contracts and Property Management
You must use coach-class accommodations for all train travel, except when your agency authorizes first-class service.
Title 41: Public Contracts and Property Management
PART 301–10—TRANSPORTATION EXPENSES
Subpart B—Common Carrier Transportation
Train
§ 301-10.161 What class of train accommodations must I use?