Find a station or maybe an historical Pub or pot luck.

Burnham-on-Crouch, Step free Rail Travel in Essex, wheelchair accessible trains.

Burnham-on-Crouch station, Station Road, Burnham-on-Crouch, Essex, CM0 8BQ

The station is on the Greater Anglia Line.
Burnham-on-Crouch has step free access from the carpark to platform.
Burnham-on-Crouch station car park has 108 Spaces in the Car Park including 1 Accessible space.

More comment : National Rail Guide