Er... where did you hear that? There's GOBS of horsepower. The diesel engine itself (which drives the generator) can be in excess of 6,000+ horsepower. And it's not uncommon for each individual electric motor that drives the wheels to be in excess of 750 horsepower; even 1,000+ horsepower. Obviously, the torque is king here (Many locomotives can start a load with over 100,000 ft/lb's of torque), but there's still plenty of horsepower. In fact, the difference between DC actuated trains (DC generator drive by diesel engines) and AC actuated trains; is expressed in horsepower. Any old train mechanic will tell you that DC trains are good for up to 3,000 horsepower; and AC trains are good to go above 3,000 horsepower. It's probably accurate that at a complete standstill, a train has perhaps 100,000 ft/lb's of torque when the engineer pulls the lever, and 0HP; but that's only for a fraction of a second. The minute it lurches forward it's got horsepower; and lots of it. Horsepower climbs as the train accelerates.
Horsepower is a mathematical equation. It's essentially torque; but with the factor of time added. A fixed torque value x a fixed time value = 1 horsepower. (Those values are determined by who is doing the measuring and on what scale. Imperial horsepower is 550ft/lbs per second for example). Something with zero horsepower mathematically cannot move. When you take torque, and you start adding motion, you get horsepower. My favorite way I've heard it explained is "Horsepower is how fast you hit the brick wall, torque is how far you take the brick wall with you". Horsepower has a disproportionate effect on top speed, and torque a disproportionate effect on acceleration from zero. Hence electric cars, which have 100% of their torque available from a standstill, having acceleration that gasoline-powered supercars could only dream of. But because electric motors don't have a ton of horsepower (and manufacturers usually don't include transmissions in electric cars), their top speed is limited.
OP; those numbers are fine. Manufacturers are always super optimistic with power ratings. Most vehicles can assume about a 15% drivetrain loss. Which is spot on where you're at.
Back in the day, it was way worse. During the muscle car era, they'd test engines in ideal ambient conditions with no exhaust, no air intake, no water pump or alternator, etc., and right at the flywheel. That's why the salesman would tell you that Hemi had 400 horsepower; but if you ever took it to a Dyno, they'd say you had 210 horsepower at the wheels. Today's V6 cars are actually faster AND more powerful at the wheels than most of the big V8 cars of the 50's, 60's and 70's. The early 60's 302 V8 Mustangs for example, would be lucky to get 140hp at the wheels. A V6 3.7L Mustang you can buy today will push 280 at the wheels (and it's advertised at 305hp).
With a few bolt on mods you can get those numbers up quite a bit if you want. You can also buy a more powerful bike. Lots of options if you want bigger numbers.