I've only found mentions online about spraying post buckling during repairs, but pre-emptive spraying does (did) occur. You will hear about speed restrictions o

I've only found mentions online about spraying post buckling during repairs, but pre-emptive spraying does (did) occur. You will hear about speed restrictions on hot days to avoid buckling. https://www.researchgate.net/figure/Buckling-of-a-railway-track-during-the-January-2009-heatwave-in-Melbourne-Joe_fig1_236455007 https://www.researchgate.net/figure/Buckling-of-a-railway-tr...