I'm going to calculate the blast size of the Sonic Rainboom. I talked with a few trusty-worthy people on calculations, asking if it would be appropriate to use the size of an explosion's blast ring as it's air blast radius and they were cool with it, so here I am now. The blastwave of said explosion was big enough that it travelled all the way to the Rock Farm.
The episode: "Over a Barrel" shows the Mane 6 riding a train to Appleloosa. They began riding at an unknown time, but I do know for certain it was at least in the afternoon when the scene started. Later on we see it cut to nighttime, then morning where they are attacked by the buffalo. Afterwords, they finally arrive in Appleloosa at 2:00 PM according to the clocktower, with it's hands between the 1 and 3 pm mark. When we first see the train it appears to be in the afternoon, and they've definitely been riding for some time before we first see it since they're in the desert. So here's the timeframe: The sky when the train first appears in the episode is the same color as it is when they arrive at 2:00 PM the next day. So I'll assume it's roughly 2:00 PM when we see the train at the start of the episode. This is a 24 hour time-frame.
For those wondering about the relevance of Appleloosa, that's because of the official Map of Equestria, which depicts the Rock Farm as slightly farther than Appleloosa. This means that however far Appleloosa is, I can apply it to the Rock Farm which the blast wave of The Sonic Rainboom passed over.
Took me a lot of work, but I finally found a post saying that early steam trains would typically travel at speeds of 25 mph. This translates to 40.2336 km/h. Suitable considering that's the average gallop for equines, and considering they are pulling the thing with no signs of being slowed by it.
40.2336 x 24 = 965.6064 km
Plugging this into StarDestroyer.net to get a value of 52.5 Teratons. Dividing by 2 because the explosion is non-nuclear, and we end up with 26.25 Teratons. Holy hell! Country level high tiers. What a world.
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