Although trams , underground trains and light rail systems were included , the majority of transport operations controlled by the PTEs were bus services .
The PTEs were local authority bodies responsible for running transport operations in their respective regions , accountable to the PTAs .
Although trams , underground trains and light rail systems were included , the majority of transport operations controlled by the authority bodies were bus services .
The PTEs were local authority bodies responsible for running transport operations in their respective regions , accountable to the PTAs .