Hi Gregoryzim,
as far as i know there is no import option within WDP for importing Itrain details.
The structure of the itrain details is in my opinion not suitable.
I think that if you're a serious user of WDP you're better of starting a new database. I know and tested almost all these Railware software, and i decided after a lon testing period for WDP.
Feel free to contact me if you've more questions.
Grtz
eric