jis
Permanent Way Inspector
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They could use the Indian Railways method when they don't know for sure which subtype of a car will be in the consist. They give confirmed reservations only for the least common denominator of spaces, and release the additional spaces to waitlist and RAC when they know what is in the actual consist.(b) Because of the different internal configuration between Viewliner Is and Viewliner IIs, they can't be used interchangeably in the reservations system unless renovated, and if Is are subbed for IIs, it gives customers a "don't know what to expect" situation. Admittedly there's some of this with the Superliner Is and IIs, but at least they have the same number of rooms.