Technical inspection issues are often a problem for actually running old machinery. Modern standards may be much stricter or simply don’t fit “the old ways” anymore. Keeping in mind that museum use is (and should be) very different from operation at full load gives room for discussion with the responsible inspectors. For example hoisting devices, say harbour cranes, with a max. load of originally 3t, now lifting mere 200kg for demonstration purposes suffer a fraction of the strain they were built to support.