this is my city with a 100k+ population, heres an explanation to what each colour and number means:
- blue lines are bus lines (i might have forgot to draw some of them but its ok ig)

- purple lines are tram lines

- orange lines are train lines

- the pink line is a bus shuttle from the main bus station to the airport with no stops

- the light orange are unused train tracks

- the white highlight shows lines that are going to be used in the future

1 is the main train station

2 is the main bus station

3 is the airport

4 is the modern city center with office space, left of it is the old city

5 is the industrial area

6 is the office park

i want the most ideal metro system thats going to be underground in the city center and the greater city center and overground in the rest of the city. budget is not an issue because i play with unlimited money, help would really be appreaciated!