We don't have synonyms for pedrail yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are bedrail.
(n) :
A vehicle, such as a traction engine, fitted with these devices.
(n) :
A device intended to replace the wheel of a self-propelled vehicle, allowing traversal of rough roads and the ability to climb over obstacles. The tread consists of a number of rubber-shod feet connected by ball-and-socket joints to the ends of sliding spokes attached to rollers and springs.
(n) :
A vehicle, such as a traction engine, fitted with these devices.
(n) :
A device intended to replace the wheel of a self-propelled vehicle, allowing traversal of rough roads and the ability to climb over obstacles. The tread consists of a number of rubber-shod feet connected by ball-and-socket joints to the ends of sliding spokes attached to rollers and springs.