You can't apply for the drivers position unless you are already a driver as GBRf do no recruit trainee drivers.
The ATM position is a shunter/ground staff. You will be responsible for the safe preparation of trains, inspecting loads and vehicles, pulling points, coupling and uncoupling etc etc.
You will have use of a company van to get you from your signing on point to where ever the work is though sometimes you may travel on passenger trains, get a taxi or travel up front with the driver of the train you are working.
It will be an annualised hours contract and will be contracted to work 1818 hours per year. 200 hours are automatically taken off due to holiday so your actual working hours will be 1616 per year accross the remaining 48 weeks.
Depending on the roster, you can work anything from 0 hours one week to 62 hours the next and anything in between. If you fail to meet the 1616 hours by the end of the year the remaining balance gets written off but you will still get paid the same amount....currently £28.2k per year with 13 pay days.
As I said earlier, overtime is paid at standard rate in one lump sum at the end of the year. So the best way to work it if you can is do as little contract hours as possible but beef it up with overtime.
Ie last year I only did about 1450 contact hours but managed 600 overtime hours.
Note...I should say this is how it works with most of the company. As this is a new depot with new employees the terms and conditions maybe different.
Hope that helps.