At the height of the silver age Superman could cross the universe in 10 seconds, juggle planets with his pinky, and had every power including superknitting. Of course he wasn't always like that. But even before the silver age power creep he was still Superman. We all know the saying. Faster than a speeding bullet, more powerful than a locomotive, able to leap tall buildings in a single bound. Why they don't include bulletproof I don't know. Still how powerful does this make Superman? I don't know. Being vauge faster than and the like we can't be exact. But we can estimate.
Faster than a speeding bullet.
The fastest bullet is about 1,700 mph. If you want to try and dodge it, you have to be 500 feet away. Now here my research if a tad faulty because I couldn't find a date on this bullet. I'm guessing two things here. This is a modern bullet, and gun technology hasn't really sped up bullets since the 1930's. So going with this as Supes minimum sped. He's twice as fast as sound. By the time you hear the swoosh of his arrival, he's got you half way to jail.
More powerful than a locomotive.
One of the post powerful locomotives of the 1930's was the Union Pacific steam engine it had 97,664 pounds force or 434 kn.For those of you who don't know what that means it had 5000 horsepower. Or the ability to lift 165,000,000 pounds. that's 825,000 tons. Even golden age Supes had a str of over 100
Able to leap tall buildings in a single bound.
Now here we can be more exact. Superman can leap tall buildings, not all buildings. So he can't clear the tallest. Which means if you can fortify yourself at the top of the newly built Empire State building he can't leap the 1,250 ft to get you. He'll just have to run up the stairs before you can hear him, and smash through the door. Uhm Yeaa!?
Now I'll admit math isn't my strongest subject and I didn't spend hours researching this. So anyone who can correct the above points please do so. But on behalf of the criminals of the universe. Please Krypton make more kryptonite.