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Thats very true indeed but yet other issues include cost of runing ie..viable or not viable for a service to be formed of a certain ammount of cariages / units plus the fact that TOCs theesedays like to make as much money as possible and that to save money on running costs at the same time in what ever way they can ie..Arriva are very keen on saving money on fuel by means of encouraging economic driving.
If you take alook the skegness service in the summer and the use of the HST set on this route it is if im right formed of 9 cariages and from my experence of it it is always packed out therefore being viable for EMT to run as is also with the maximum lenghth as notibley this only calls at certain stations en route.
If they where to use say 4x class 158sor 156s making eight cariages and the runing of eight engines which efectivley would cost more money as there is more fuel being used compared to using a HST set with only two engines being used though much bigger engines there is still less fule being consumed therefore viable for EMT to run a HST set and not DMUs on this extra service.
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