Aarau station is a straightforward, high-throughput transport hub that serves as the gateway to the capital of Aargau. For a first-time visitor, the most important thing to understand is that the station is split into two distinct, adjacent areas: the main SBB (Swiss Federal Railways) station and the separate "Aarau WSB" facility.
The main SBB station features six standard-gauge tracks, numbered 1 through 6. These are arranged in a classic through-station layout, serving regional, InterRegio, and InterCity trains that connect you to major hubs like Zurich, Basel, and Bern. These platforms are easily accessible from the main station building and are clearly marked.
Directly adjacent to the south side of the SBB yard, you will find the Aarau WSB station. This is a separate facility dedicated to the metre-gauge Aargau Verkehr (AVA) services, such as the S14 line toward Schöftland and Menziken. This sub-station consists of three tracks, numbered 11 through 13. While it operates as its own entity, it is physically connected to the main SBB station via a common pedestrian subway.
Because the station layout is relatively compact with only nine total tracks (six standard-gauge and three metre-gauge), you do not need to worry about the complex, multi-level navigation required in larger Swiss cities. It is a very manageable station; even with heavy luggage, you can comfortably move between the SBB and WSB platforms in under five minutes.
The most common point of confusion for first-time visitors is the numbering system. You may notice a "Platform 0" at the station; do not be alarmed, as this is simply a design quirk resulting from past expansions where new tracks were added without renumbering the existing ones. Simply follow the clear overhead signage in the main hall, which directs you toward either the SBB platforms (1–6) or the WSB platforms (11–13).
To ensure a smooth journey, I recommend downloading the SBB Mobile app. It provides real-time platform information and is the most reliable way to navigate your connection, especially if you are transferring between the standard-gauge SBB network and the regional WSB lines. The station is fully accessible, with elevators available to assist if you are carrying heavy bags or travelling with a stroller.