Definition of "workable"

Penrhyn Quarry vertical-boilered 0-4-0 locomotive "George Henry," built by De Winton & Company in 1877. It is the last survivor of its class, and is still in workable condition.

1945 July and August, “The Penrhyn Railway and its Locomotives”, in Railway Magazine, page 208, photo caption

The point was also made that the size and diversity of GWR's network and the number of services that are not capable of having reservations (Thames Valley, many branch lines, and so on) has meant a mandatory reservation system is not a workable system for them.

2021 January 27, Barry Doe, “Reservations on XC and GWR services”, in RAIL, number 923, page 58