London Midland has announced it is due to axe around 150 jobs as it struggles to cope with rising costs.
The rail company, which runs trains from Watford Junction, Bushey, and Kings Langley, said that the redundancies would not affect the service to passengers.
Patrick Verwer, managing director of London Midland, said: "The service to our passengers will not be affected by the changes. We have made good progress over the last year. Our train service is much improved and higher customer satisfaction scores tell us passengers can see the difference.
"Like every other business however, we have to keep our costs under control. Our proposal has been designed to increase efficiency and reduce our costs while continuing to improve trains and station services."
London Midland said it had begun consultation with its employees over the looming redundancy.