@startuml
scale 1.5
object "Station : Melun" as melun
object "Station : Gare de Lyon" as garedelyon
object "Station : Maisons-Alfortville" as ma
object "Station : Vert de Maison" as vdm

object "Liaison : l1" as l1
object "Liaison : l2" as l2
object "Liaison : l3" as l3

object "Ligne : R" as ligner
object "Ligne : RER D" as rerd

object "PS : Parcours simple1" as ps1
object "PS : Parcours simple2" as ps2
object "PAC : Parcours complexe" as pc

melun <-- "debut" l1
garedelyon <-- "fin" l1
garedelyon <-- "debut" l2
ma <-- "fin" l2
ma <-- "debut" l3
vdm <-- "fin" l3

melun <-- "debut" ps1
garedelyon <-- "fin" ps1
garedelyon <-- "debut" ps2
ma <-- "fin" ps2
melun <-- "debut" pc
vdm <-- "fin" pc

l1--o ligner
l1--o ps1
l2--o rerd
l2--o ps2
l3--o rerd
l3--o ps2

l1--> ligner
l2--> rerd
l3--> rerd

ps1--> ligner
ps2--> rerd
pc o--ps1
pc o--ps2

@enduml