Pre-Covid, how many 158s would be used each day on “Provincial” routes other than the Liverpool to Norwich?
EMR have 26 x 158, of which 23 are required for service.
Liverpool to Norwich requires 12 units, Liverpool to Nottingham requires 7 units*, leaving 4 for other duties. In reality the 156/8 fleet was pretty interchangeable, and often 153s were also subbing on the Liverpool to Nottingham section.
* Generally it was 2 x 158 from Liverpool to Nottingham were the front 158 continued to Norwich, the rear 158 detached and shunted, before attaching the the incoming Norwich to Liverpool and departing around 75 minutes later. Units were often swapped out at Nottingham if needed, and they also interworked on to other routes at certain times of the day. EG, 1629 arrival from Liverpool split at Nottingham with the front unit going forward to Norwich and the rear forming the 1650 to Derby (and then the 1742 Derby to Crewe).
I understand that if EMR gets all the 170s they are expecting they will have enough stock to at least run Norwich - Liverpoool at 4 car as well as hourly frequency on most routes the originally planned. Does it mean that Grimsby - Leicester won't be leaving people behind if an hourly frequency happens? Who knows, as better frequency could = more passengers. Personally I still think things will be tight with 170s / 158s but at least they have something to build on and can keep their eye out for other 158s / 170s as they are released from other operators in the future.
When/if EMR get their full compliment of 170s (44 units) there will be enough for everything to be formed of 170 except for Liverpool to Nottingham, which was originally destined for another operator.
The original plans allowed for 38 from the 44 units to be diagrammed, everything being a single 2 or 3 car 170 except for Skegness in the summer which would of had 2 of its 5 diagrams booked for double units.
The non release of 12 x 171s from Southern and their replacement with 12 x 170s from TfW also means EMR will have 6 more 3 car 170s and 6 less 2 car 170s than before, 17 x 3 and 27 x 2 instead of 11 x 3 and 33 x 2.
The retention of the Liverpool-Nottingham and the 158s means that on paper, EMR will have a surplus of up to 12 units, depending on whether some 158s get split and reformed in to 3 car units.