This happens now and then due to network traffic or any other problem.
Tips:
(1) Please enter Train name as "Not yet ready" or "Under construction"
(2) Instead of entering all the details and saving finally, first enter starting, ending and a few intermediate stations and give "Update". In this way complete in 2 or 3 instalments so that if the editor is...
more... stuck up you won't have to retype everything.
(3) Enter train name after you are satisfied.
(4) You will get adjusted to it, don't worry.