Train problem

train.rb

position_train = 0

def train_leaving_station(station, train)
  return if station.empty?

  if station.last == train[position_train]
    station.pop
    position_train++

    train_leaving_station(station, train)
  end
end

def possible_sequence?(train)
  entry = (1..train.size).to_a # [1,2,3,4,5]
  station = []

  
  for(i =0 ; i < vagoes ; i++) {
    number = entry[i]
    station.push(number)

    train_leaving_station(station, train)
  }

  station.empty?
end

puts "[1,2,3,4,5] #{possible_sequence?([1,2,3,4,5])}"     # => true
puts "[5,4,3,2,1] #{possible_sequence?([5,4,3,2,1])}"     # => true
puts "[5,4,1,2,3] #{possible_sequence?([5,4,1,2,3])}"     # => false
puts "[1,3,2,5,4,6] #{possible_sequence?([1,3,2,5,4,6])}" # => true

__END__

5 = vagoes
12345
54321
0
6
123456
132546
0
0