Gotthard Base Tunnel derailed wagon
photograph of Swiss Federal Railway company SBB media release at https://news.sbb.ch/medien/artikel/124073/bahnverkehr-im-gotthard-basistunnel-unterbrochen
HS2 unveils Bromford TBM
courtesy of HS2 media release https://mediacentre.hs2.org.uk/news/hs2-unveils-huge-tunnel-boring-machine-ready-to-dig-hs2s-bromford-tunnel-in-the-west-midlands