paulravuslante
Member
Personally i do also think it is a waste of a unit to run this shuttle service. With some good planning it is perfectly possible to run both the Heathrow Connect and the T123 to T4 shuttle service with just three units. This means they would operate on a PAD - T123 - T4 - T123 - T4 - T123 - PAD diagram every hour and a half each. This would ensure that T123 to T4 still get four trains per hour (every fifteen minutes in each direction). This would very much increase reliability and flexibility by meaning there would be two spare units a day (just like there used to be) instead of only one spare unit a day.
I must say this shuttle has a very long and complex history:
Firstly Heathrow Express trains only ran to Heathrow Airport junction which was a (now closed) station near Hayes & Harlington where passengers had to change for buses to the terminals. Then when T123 station opened Heathrow Express trains started running through to T123 station. Then a few years later T4 opened and Heathrow Express trains started running through to T4 station. Shortly after the Heathrow Connect was introduced but only ran to T123 station but shortly after was extended to run to T4 station as well (meaning T123 to T4 had six trains per hour). Then T5 opened which meant that all Heathrow Express trains would run to T5 station while all Heathrow Connect trains would run to T4 station. This meant that T123 to T4 only had two trains per hour while T123 to T5 had four trains per hour. A few years later it was decided to run all Heathrow Connect trains (as well as the Heathrow Express trains) to T5 which meant that T123 to T5 had six trains per hour. At the same time the shuttle was introduced between T123 and T4 which gave them four trains per hour (the shuttle just ran back and fourth every day every fifteen minutes). For this shuttle 360 205 was refurbished and repainted from Heathrow Connect to Heathrow Express livery and had the seating converted from 3+2 to 2+2 and had the toilets locked out of use. Although in reality 360 201 / 360 202 / 360 203 / 360 204 often appear on the shuttle while 360 205 often appears on the mainline Heathrow Connect services. This arrangement lasted for quite a few years until last year when Heathrow Connect services where diverted back to T4 but the shuttle also continues to run. This means that T123 to T4 now has an increased service of six trains per hour (instead of four trains per hour) but T123 to T5 now has a reduced service of four trains per hour (instead of six trains per hour).
This will get even more complicating soon when Crossrail starts as Crossrail will replace the Heathrow Connect services. This will mean that all Crossrail services will go to T4 (four trains per hour) while all Heathrow Express services will go to T5 (four trains per hour).
T4 has only ever generally had 4 trains an hour, currently with a 10 or 20 minute gap between departures (2 shuttles and 2 connects). Previously it had a 15 minute service but this requires a driver to be placed on both ends of the unit due to the turnaround times at each end. A shortage of drivers has meant that this had to be abandoned on Mondays to Fridays but this still occurs generally on Saturdays with the 2 Connects continuing to T5 instead.
On a Sunday there are 5 trains an hour on an uneven frequency due to the Connect going directly to/ from T4. The Connect and shuttle service is operated with 3 units on a Sunday, when the Connect runs once an hour, so I'm not sure how you worked out that it would be possible to do this with a half hourly service. The enhanced shuttle service on a Sunday is only possible as HEx operates to a different timetable, which sometimes makes the journey from PAD to T5 longer on some journeys. Don't forget that there is only a single line tunnel between T4 and T2&3 so this restricts the frequency of trains and causes problems when trains start arriving late.
I will be interested to see how Crossrail get around this problem. HEx recently tried an experiment to see if trains could split at T2&3 with half going to T4 and the other to T5. However the experiment ended in disaster when trains ran late or had problems coupling up and was swiftly abandoned.
The Heathrow Connect website makes it difficult to work out (IMO) that it serves T4. The maps make it look like it only runs PAD to Heathrow Central.
There is a reason for this. Trains can be diverted at short notice to either T4 or T5 depending on operational requirements (usually a failed train on the Shuttle). I've experienced this many times when driving these services.
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