The mode of rail travel is expected to be the lowest, logical option via the most direct route that factors in cost, time constraints and business needs of the trip. Except as otherwise provided herein, only coach tickets will be reimbursed or allowed. Acela tickets will be reimbursed or allowed only when it is the most economical option given time constraints of the business trip and it is less expensive than air travel.
If a traveler elects to take the Acela or upgrade to business class and agrees to pay the difference between the two fares, the difference will be calculated from the least expensive logical rail fare on that routing. Documentation should be provided to support this calculation