I think you can get adapter joiners for this? Do be aware that Peco do a G45 track, which I think is code 250 (?) and will join to LGB and other code 332 rail using the said adapters, but the also do Gauge 1 45mm track which is much finer - code 200 I think - and I believe is NOT compatible with the code 332 types......
Track powered locos can have trouble of Peco G45 points, with the skates sometimes shorting on the Peco metal frogs, but they are generally OK on Peco G45 straights and curves. LGB and other G scale locos will not run well (or at all) on the Gauge 1 track, as their very deep flanges bottom-out on the rail chairs.
Jon.