Why do ticket checks/sales not happen on some Rail Replacement services?

[Prodigy]

So a few weeks ago I had to travel on a rail replacement service between Mossley and Manchester, as there's work taking place on Sundays. I had my money ready to buy a ticket, which I presumably thought would be from the driver, as the ticket office from the station was closed. However, to my surprise I boarded the bus and the driver mentioned nothing about tickets and passengers were just free to board. My friend informed me that this had happened before when he used the service. When we got to Victoria there was also no checks.

So I was wondering, is it common practice NOT to check or sell tickets on rail replacement service, and how do the TOC cover the costs of doing this?

 

[Welshman]

There is already a thread on this subject in the "General Discussion" section.

 

[RJ]

The drivers will be hired in from some local bus firm. They're there to drive the bus, not collect fares on behalf of the TOC. FCC have reportedly sent RPIs out on RR bus jobs however, doing people who didn't buy a ticket from the station!

 

[clagmonster]

If the ticket office at your origin is open, you must buy a ticket there, however in the Ashton-under-Lyne to Manchester Victoria case, this is not so. Is there an accessible TVM?
If not, then if no tickets are available on the bus, you should pay at the booking office on arrival at Manchester Victoria.