[ninjanomnom]

Orbital mechanics being what they are, you can't simply speed up to intercept something in orbit. Very roughly speaking, as you increase speed you increase the distance the opposite side of the orbit is from the orbited body. This means if you're trying to catch a bunch of satellites on a single orbital path you'll miss most since your orbit is different now. There are ways to do what you say but I dont know if any countries have managed to make a reusable orbital satellite killer like this.

[jhgb]

Since you're talking about a "satellite train", so as to speak, I'm not sure you need to "speed up to intercept". If for example the orbital period is 90 minutes and the time between two consecutive satellites passing through the same point is 5 minutes, just make sure that your orbital period at the time of intercept is 95 minutes and then you can shoot down one satellite per orbital period. There's not a lot of maneuvering that the electrically propelled satellites could do on quick notice.