Grimsby town
Member
- Joined
- 4 Apr 2011
- Messages
- 865
The problem with demand for North Transpennine is that there isn't an accurate baseline of demand to forecast from.Demand forecasting, in terms of methods sanctioned by the Transport Analysis Guidance is a relatively mature science. Yes, forecasts always have errors, and are an art form as much as a science. As an art form, it has proven to be there and thereabouts. Those with access to data have repeated stated that forecasts for schemes like Borders and others have been pretty much on the money, contrary to what some conventional wisdom might have you believe.
TRU is much more incremental and the scope for forecasting errors is even smaller. I trust DfT forecasts over some random vibes of 'should cater for 3x'..
Pre-Covid a lot of trains were 3 car 185s because the 802s and mk5s weren't fully introduced. Even were they had been introduced, it generally takes a few years for passengers to respond to improvements to the quality of service by shifting from car or making more journeys. So it's quite possible that demand could have been suppressed by the length of train and fairly regular overcrowding. Personally, I found it a real chore using TPE in those pre-Covid years.
Then Covid came along and significantly changed travel demand patterns. That had a significant impact on travel demand forecasting. A lot of transport forecasting was built of census travel to work demand pre-covid which became useless during the 2021 census because it was recorded during lockdown. So it's definitely more difficult to get an accurate forecast of demand than it was for the borders line.
Additionally, there's not been a time since 2019 that travel hasn't been significantly impacted by restrictions, either imposed by Covid or because of regular engineering works as part of TRU. So there probably hasn't been an accurate and un-suppressed baseline of travel demand on TP North for over a decade. Sure, this can be mitigated for in demand forecasting, but it will mean there's slightly more uncertainty in forecast than would usually be the case. The decision to me looks like a risk adverse one based on low forecast of increased demand.

