Song about a girl on a train?

PLEASE HELP!

I believe the song may have a connection to Lonnie Donegan, I had a tape of his when I was young, (80s, but the song could predate this)

The lyrics I can remember are
"But I cant forget her, shes always on my mind, I'll search the whole world over now until that girl I find"

I also believe the song mentioned the girl getting off the train and the singer stating something like, "I go on to Bushy Park"

I cant find anything close to these lyrics on google, but someone must know the song title or artist! Thanks in advance!