'Clasicos'. HFF Everybody.

The original 1919 metro trains (called 'clasicos') restored and on display at Chamartín station on an unused section of track, but they don't seem to be available to view close up. The fences have always been in place and guards patrol whenever I pass by, which is often (and slightly worrying; do they see me coming and think; "Here comes that hooligan Englishman again with his dastardly camera!")?
BTW when I first visited Madrid in 1981 to see my sister who had moved here that year, these 'clasicos' were still in circulation and I used them a lot. They were horribly hot and rickety by then. I think they were finally de-commisioned the following year.