At the white stop line, or with no white line, at least 15 feet back.
15 feet
Stop at the stop lines for the railroad tracks or if there aren't any there stop 15 - 20 feet away from the gates.
The truck will stop at the crossing.
You should stop at a railroad crossing with mechanical gates and lights whenever the lights begin flashing. Do not attempt to cross while the gate is being closed.
any amount
You must stop within 50 feet but no closer than 15 feet of the railroad crossing. Never stop on railroad tracks or go when the gate is down.
15
15
150
50 feet
15 and 50 feet
When approaching a railroad grade crossing where the gates are down or the lights flashing you should stop before the stop line. If there is no stop line then at least 15 or more feet from the nearest rail.