My 390 at MAN arrived with two outer windows shattered by ice debris, even with restricted speeds. Apparently it happens every year, and the solution is to smash all the shattered glass out so it doesn't fly off passing through stations, and allow the unit to work the next diagram(s) with just the inner windows. The inners are "practically bullet-proof", but still have sticky-back plastic added, after the shattered outer "skin" is gone.
I can imagine that's why we're down to 2TPH from 3TPH today, with ⅓ of the fleet having yesterday's windows replaced, but it does give some nice extra recovery time to deal with the TSRs.