Maximum authorized speed on excepted track is?

Answer: B — 10 MPH

Excepted track is a work zone condition where operations are restricted to a very low speed to protect crews and equipment. The standard maximum authorized speed there is ten miles per hour. This small speed margin gives the engineer time to observe workers and flaggers, react to any obstructions, and stop safely if needed, since the track and surroundings may not be in normal service. Speeds like five miles per hour would also be safe but are not the typical maximum; speeds higher than ten miles per hour are not allowed on excepted track unless a specific sign or authority directs otherwise. So the ten mph limit is the usual rule.