samuelmorris
Established Member
Granted, the extension to Reading has upended some of the proposed timetabling, which wasn't final anyway, but doing some basic maths on the crossrail prelim timetable, I'm struggling to identify why they'd need 65 train sets.
Working this out from an over-simplified perspective of round trip times, I came up with rough figures like this:
Off-peak
Shenfield-Heathrow: 2tph, c. 180 min round trip -> 6 units
Shenfield-Reading: 1tph, c. 240 min round trip -> 4 units
Shenfield-Paddington: 3tph, c. 120 min round trip -> 6 units
Abbey Wood-Heathrow: 2tph, c. 120 min round trip -> 4 units
Abbey Wood-Reading: 1tph, c. 180 min round trip -> 3 units
Abbey Wood-Paddington: 3tph, c. 75 min round trip -> 4 units
Total: 27 units
Peak
Liverpool Street-Gidea Park: 6tph, c. 80 min round trip -> 8 units
Shenfield-Maidenhead: 1tph, c. 210 min round trip -> 3 1/2 units
Shenfield-West Drayton: 1tph, c. 150 min round trip -> 2 1/2 units
Shenfield-Paddington: 4tph, c. 120 min round trip -> 8 units
Abbey Wood-Maidenhead: 1tph, c. 150 min round trip -> 2 1/2 units
Abbey Wood-West Drayton: 1tph, c. 105 min round trip -> 1 3/4 units
Abbey Wood-Paddington: 4tph, c. 75 min round trip -> 5 units
Total: 31 units (ish)
Which gives me a total of 58.
Just realised after I posted this that I was missing 2tph Paddington on each side.
Does this seem reasonable based on a fleet of 65? Not sure exactly what the in-service ratio normally is.
Working this out from an over-simplified perspective of round trip times, I came up with rough figures like this:
Off-peak
Shenfield-Heathrow: 2tph, c. 180 min round trip -> 6 units
Shenfield-Reading: 1tph, c. 240 min round trip -> 4 units
Shenfield-Paddington: 3tph, c. 120 min round trip -> 6 units
Abbey Wood-Heathrow: 2tph, c. 120 min round trip -> 4 units
Abbey Wood-Reading: 1tph, c. 180 min round trip -> 3 units
Abbey Wood-Paddington: 3tph, c. 75 min round trip -> 4 units
Total: 27 units
Peak
Liverpool Street-Gidea Park: 6tph, c. 80 min round trip -> 8 units
Shenfield-Maidenhead: 1tph, c. 210 min round trip -> 3 1/2 units
Shenfield-West Drayton: 1tph, c. 150 min round trip -> 2 1/2 units
Shenfield-Paddington: 4tph, c. 120 min round trip -> 8 units
Abbey Wood-Maidenhead: 1tph, c. 150 min round trip -> 2 1/2 units
Abbey Wood-West Drayton: 1tph, c. 105 min round trip -> 1 3/4 units
Abbey Wood-Paddington: 4tph, c. 75 min round trip -> 5 units
Total: 31 units (ish)
Which gives me a total of 58.
Just realised after I posted this that I was missing 2tph Paddington on each side.
Does this seem reasonable based on a fleet of 65? Not sure exactly what the in-service ratio normally is.
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