The Jacobus Kapteyn telescope weighs about 40 tonnes and has a 1 m mirror on an equatorial mount. It was finished in 1984, in time for the inauguration of the observatory and it was in constant use until 2003. Since then it was used for short periods, until it was handed over to SARA, the Southeastern Association for Research in Astronomy (a consortium of 12 US universities plus the IAC). They plan to run it robotically
The official website is still at http://www.ing.iac.es/Astronomy/telescopes/jkt/index.html