
Passenger stations are generally divided into two main categories: terminal stations and through-stations. A terminal station, sometimes called a stub-end station, is where trains arrive and terminate. The tracks end at the platforms and the train must reverse direction before departing again. Large cities often used terminal stations because they allowed passengers to arrive directly in the city center. Famous examples include stations in Paris, London and Stockholm.
On a model railroad, terminal stations create interesting operations because locomotives often need to be uncoupled and moved to another end of the train before departure. Additional switching movements may also be required for sleeping cars, mail wagons or dining cars. However, due to the normally very short line lengths possible on a Model Railroad the effect of a terminal station is that the trains just stand there all the time, since switching takes almost as long time as in real life but the travel between stations on the layout very short time. For a branchline that is acceptable, but selecting a terminal station as the main station of the layout may not be optimal.
Through Stations
A through-station allows trains to continue straight through the station without reversing direction. These stations are operationally simpler and require less space, which makes them very suitable for many model railroads. Through-stations are commonly found in smaller towns and along main lines where trains continue toward other destinations. The through station allows for nice flow of trains and very useful on a Model Railroad.
In some circumstances the station is small and do not have the signals or turnouts which makes a station. It´s then a just a stop, not a station.
A junction station is a station where passengers and freight can transfer between two or more railway lines. Unlike a through or terminal station located along a single route, a junction station connects different lines. Passengers often change trains here when travelling between a main line and a branch line. A typical example is a local train arriving from a rural branch line, where passengers transfer to an express or regional train on the main line. Freight traffic may also be exchanged between the different lines, making the station an important operational hub.
On a model railroad, a junction station creates many interesting operating possibilities. Passenger trains can meet to exchange travelers, while freight wagons arriving with goods on one line can be transferred to another destination. Even a relatively small junction station can therefore generate a surprising amount of realistic traffic and operational variety.
A crossing station is a station where two railway lines intersect. The lines may cross at the same level using a diamond crossing or pass above and below each other on separate levels. In many cases, connecting tracks allow trains to transfer from one line to the other, creating an important interchange between different routes. Crossing stations often become busy transportation hubs because they combine traffic from two separate railway lines. Passengers may transfer between trains serving different routes, while freight wagons can be exchanged between railways travelling in different directions. Depending on the track arrangement, the station may also include flyovers, connecting curves or junction tracks that enable trains to change lines without reversing.
On a model railroad, a crossing station creates interesting operating possibilities. Two independent railway lines can be operated simultaneously while still allowing selected trains to transfer between them. Passenger trains can exchange travelers, freight wagons can be routed in several directions, and operators must coordinate train movements carefully to avoid conflicts at the junction. A well-designed crossing station therefore provides both visual interest and a wide variety of realistic operating scenarios.
Steam locomotives additionally required servicing after arrival. Water cranes, sometimes called water horses, were commonly placed near the waiting tracks or close to the station exits. These allowed steam locomotives to refill water quickly before continuing their journey. Coal stages, ash pits and small engine sheds were often located nearby as well. On a model railroad, even a simple water crane beside a siding can instantly create a stronger steam-era atmosphere.
In large stations, separate locomotive depots were often located just outside the passenger area to avoid congestion. Electric locomotives usually required less servicing and therefore reduced the need for extensive locomotive facilities in later eras.

Overpasses or footbridges is another common solution. These bridges became iconic features of many railway stations and can create attractive visual elements on a model railroad. Modern stations often combine elevators, escalators and covered walkways to improve passenger flow and accessibility
The size and complexity of a passenger station depended heavily on the surrounding community.
A countryside station might consist of a single platform, a small wooden station building and perhaps one passing siding. Traffic was usually light and trains stopped only briefly.
Small city stations typically included multiple platforms, freight sidings and a modest engine facility. These stations handled both passenger and local freight traffic and often became the center of the surrounding town.

For model railroaders, the most successful station designs are usually those that match the available space and the overall story of the layout. Even a small rural halt can feel highly realistic when combined with believable operations, passengers and surrounding scenery.
/ Martin