Railway Empire 2 - High Voltage is a DLC expansion for the base tycoon-sim, not a standalone release, so set expectations accordingly. What it delivers is a focused package: 10 electric locomotives and a Swiss Alps-themed map built around punishing gradients and narrow mountain corridors. If you have been running diesel and steam lines flat across the American midwest, this is the expansion that finally makes gradient management a real variable in your routing decisions. Electrified track requires infrastructure investment upfront, and the mountain terrain means your line-planning spreadsheet gets a new column labeled "grade penalty." That is genuinely interesting from a systems perspective. The locomotive roster itself is the headline feature. Ten new electric engines means meaningful choices around haulage capacity, speed curves, and power draw across different route profiles. Some of these engines shine on steep climbs where older steam units stall out, while others are better suited to high-speed flatter corridors that you link into the Alpine network. The game does not hand you a clear "best in slot" option, which is the right call. You will find yourself cross-referencing cargo weight against gradient tables before committing to a locomotive assignment, and that kind of decision depth is exactly what a DLC at this price point should be adding. The Swiss Alps map is visually distinct and plays differently enough from the base game's regions to justify its existence. Gorges force indirect routing. Mountain passes create chokepoints that rival players will contest. If you have been comfortable running parallel double-track solutions everywhere, you will need to rethink that playbook here because the terrain simply will not permit it in large sections. Tunnel placement becomes a genuine strategic lever rather than an occasional tool, and that shift in emphasis is welcome. Where High Voltage shows its limits is scope. Thirty-one Steam reviews at time of writing is a thin sample, and while 84 percent positive is solid, the base game's own review count dwarfs it, which tells you this is serving a niche within an already niche audience. There is no new campaign structure or scenario progression beyond what the map setting implies. Veteran players who have already optimized everything in the base regions will likely burn through the novelty faster than newcomers who pick this up alongside the base game. The AI opponents on the Alpine map do not appear to have received any special tuning for mountain routing, so do not expect them to punish your chokepoint mistakes the way a human competitor would. For anyone coming fresh to Railway Empire 2 and wondering whether to bundle this in: buy the base game first, spend time learning demand chains and station throughput, then come back to High Voltage once terrain is the last variable you want to stress-test. The electric locomotive mechanics are intuitive enough that the DLC does not require a separate tutorial, which is the right design call. The onboarding from the base game transfers cleanly. Bottom line is that High Voltage is a focused, honest piece of content. It does not reinvent the sim, but it does add a map that makes you think differently about infrastructure and a locomotive set that rewards careful assignment. Strategy players who treat route optimization as the actual game, not just the preamble, will get solid hours out of this. Diego, Scout Team