Post by domh245 on Sept 8, 2018 7:35:26 GMT
You would also need to train drivers and maintenance staff, get route clearance (gauging, interference, etc), which is not going to be quick or cheap. Obviously there will come a point when it is worth doing all that and installing DOO equipment*, but given what was said based on the planned timescales, the tipping point is likely going to be somewhere north of 6 months.
*Alternatively the 707s are coming off lease shortly (AIUI), are DOO equipped and are designed to be easily convertible to AC operation, and may need shortening by 1-2 cards. I don't know how long this would take or how much it would cost, but if there is a very significant delay on the 710s it might be better than 315s. Still not easy though.
The example now is ScotRail, which introduced some 365s to the Edinburgh - Glasgow route in a fairly short time whilst their 385s were awaiting a solution to the fishbowl window problem. It proved that where there is a will to introduce a new fleet quickly, things like driver training, maintenance training, and route clearing can be done quickly - you only need to train a small amount of drivers and fitters on it, rather than every driver who does the GOBLIN. Similarly, if you are willing to pay enough, route clearance can be hurried along.
707s could be a possibility, but aren't due to come off lease until December 2019, and are reliant on being replaced by SWR's Aventras, and if the 710s aren't in service by then, I doubt that they'd be either (although by that point something would have had to go seriously wrong!)