True. And feedwater is injected into the boiler below the waterline where it immediately mixes with the water in the boiler. In the steam tractors I'm familiar with, feedwater is injected at the front of the boiler away from the crown sheet.
WRT marine disasters, I've read several newspaper accounts of boiler explosions during sinkings so I believe the Wiki article is correct. The firetube boilers in the first century of marine steam were more susceptible to explosion due to the large volume of heated water compared to more modern water tube boilers. My dad's DD took a Kamikaze hit off Okinawa and the forward fireroom's water tube boilers jumped off their foundation when the plane's bomb exploded. Steam was released from the boilers but there was no explosion. The steam rose to the top of the fireroom and the boiler crew survived by going low and waiting for the steam to clear.
