Sydney Interurban Trains

[Joel Cooper <joel@abilitycorp.com.au>]

For the last 8 years I haven't been able to work this out.

I was sitting down the down stairs compartment of a Central Coast Intercity
train and couldn't work out what the metal plate was on the wall at the end
of the compartment. It doesn't seem to have a purpose. I wonder if it used
to be a sign of some sort. It's about the size of a vertical brick.

Can anyone verify what this is?

Joel