Son was coming back from London to Newcastle last night on the 9.00pm train due in at 00.40 ,they had a power failure near Doncaster and had to wait to change to a diesel unit,he gets to Newcastle at 04.10( with muggins here waiting for him) any body know if he can get some compensation for the delay? i've tried ringing customer services but the're shut until moday! or is it a lost cause? 
Get in touch with the TOC's Customer Services people on Monday - I presume it'll be GNER in this case.
Compensation is usually given in the form of Rail Travel Vouchers.
Beware though, if you present such a voucher for future rail travel which is greater than the value of the subsequent journey, then no change is given.
You should also bear in mind that if you board your train at a station where you had the opportunity to purchase your ticket prior to boarding, then only 'Standard Fares' are issued 'on-train'.
In such a situation, no discounted fares will be available from the conductor.
State your case to Customer Services during normal business hours, and you should be fine though.
They will be aware of any delays, such as were incurred in your case.
