Certainly here in the west mids most of the gas works were adjacent
to canals - both for delivery of coal from the coalfields and
collection of by products - coal tar, gas water and coke.
Thos. Clayton (Oldbury) Limited specialised in the bulk transport
of the liquid byproducts - mainly coal tar to the tar distilleries
where it was refined into a wide range of products including creosote
and chemicals used as the starting point for many dyes, drugs, paints,
flavourings and explosives!
TC(O) Ltd.'s last load on the canal was tar from Walsall Gas works
to Midland Tar Distilleries plant in Oldbury in 1966. MTD were located
at Titford Junction - with the unloading arm being on the left just
up the Titford Branch. If you have the misfortune to stir the bottom
of the canal in this area you will recognise the smell! Claytons yard
was on the other side of the titford branch, all traces disappeared
when the M5 was built.
In addition, probably because of this "niche market" TC(O) Ltd. was one
of the few canal carriers to survive the big freezes ('47 and '63) and
avoid nationalisation.
Alan Faulkner's book Claytons of Oldbury has quite a lot of info on the
gasworks served by Claytons.
springy