Please help me ID this old vintage 60's RR song

I don't have much to go on This song is about a night? train and the lyrics go:

"Mr. Conductor tell me where are we going. Mr. Conductor tell me ---?--- He just walked on by."

Thank you.

Try "Lonesome Train" by JJ Cale

Lonesome train, ride all day
Lonesome train, ride all day
Since I lost my woman, I lost my way
Mr conductor, where is this train bound
Mr conductor, where is this train bound
Is it headed up, is it headed down
Lucky for me, I'm on the sunny side
Lucky for me, I'm on the sunny side
Since I lost my woman, it's a lonesome ride
Lonesome train, ride all day
Lonesome train, ride all day
Since I lost my woman, I lost my way

I think it's "Endless Tunnel" by a group called Serpent Power.