330 MPS, S of S, 125 H S T, 999 OLT a T, 600 I the V of the DR?

I was wondring if anyone could help me I need to complete a quiz and I stuck on the 4 questions above, I need to complete it by today so if anyone can help it will be much appreciated

Answers:
999 one less than a thousand
330 metres per second speed of sound
Thats one I'm stuck on the others though!
125 High Speed Train - InterCity
999 is One Less Than a Thousand

I will msg you the other one if I get it :)
The best I can offer is:
125 HST - The High Speed Train runs at 125 mph
the only thing i can come up with for the 600 one is
600 . the valley of the death? but the right saying is 600 men rode into the valley of death (charge of the light brigade) and what the I is for no idea sorry are you sure you wrote it right? hope this may help a little

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