In article ,
(Theo Markettos) wrote:

Elsewhere on the South Western Division, I've seen an ex-LSWR bridge
where the facing bricks have been replaced (untidily) with modern ones
in just this way. The old ones were showing frost damage (not bad for
150 years) but the structure appears sound. This is just replacement
of individual bricks, not whole courses.

I get the feeling it's a one-size-fits-all replacement programme,
hence the
miscoloured bricks.

It's probable that bricks of the original colour aren't available. For
some reason that's a big problem these days. We can't even get matching
bricks for a housing scheme near me built in 1975, let alone matching 150
year old ones.

--
Colin Rosenstiel