Simplify the following text for a Grade 6 native English-speaking person.
Original: They had the door to the cab at the rear , with a railed veranda behind the cab ; this feature was very unusual on British Rail locomotives although was used on many Yorkshire Engine Co. designs and was\/is quite normal in North American practice .
Simplified: They had the door to the cab at the rear , with a railed veranda behind the cab . This feature was very unusual on British Rail locomotives .