Line B1
Laurentina ↔ Jonio · branch line — Laurentina ↔ Jonio. 19 stations.
Line B1 in Detail
Line B1 is part of the Rome Metro, operated by ATAC. It runs from Laurentina to Jonio, serves 19 stations, and is a branch of Line B: it shares the route with Line B up to Bologna and continues toward Jonio. You can transfer between lines at the main transfer stations: Termini (A/B), San Giovanni (A/C), Colosseo (B/C), and Bologna (B/B1).
The stations on the line
Timetable and frequency of the Line B1
| Direction | First train | Last train | Trains/day |
|---|---|---|---|
| Monday–Thursday | |||
| Jonio | 5:33 AM | 11:27 PM | 120 |
| Laurentina | 5:33 AM | 11:24 PM | 120 |
| Friday | |||
| Jonio | 5:33 AM | 1:30 AM | 134 |
| Laurentina | 5:33 AM | 1:30 AM | 134 |
| Saturday | |||
| Jonio | 5:33 AM | 1:30 AM | 134 |
| Laurentina | 5:33 AM | 1:30 AM | 134 |
| Sunday | |||
| Jonio | 5:33 AM | 11:27 PM | 120 |
| Laurentina | 5:33 AM | 11:24 PM | 120 |
On the shared section between Laurentina and Bologna the B and the B1 alternate: on the platform a train comes every 2–7 minutes, twice the frequency of either line on its own.
Figures taken from Atac's official GTFS (August 2026 edition), measured on a real day of each type. The ranges are the 10th–90th percentile band of the gaps, not the best-case headline figure.
Line B1 is the northern branch of Line B: it shares the route with Line B up to Bologna and continues on to Sant'Agnese/Annibaliano, Conca d'Oro, and Jonio. At Bologna, trains alternate between the destinations Rebibbia (B) and Jonio (B1).
Frequently Asked Questions
Line B1 is one of the lines of the Rome Metro, operated by ATAC. It runs from Laurentina to Jonio and serves 19 stations.
The entire trip from Laurentina to Jonio takes about 29 minutes, depending on the time of day, stops, and layover times.
The first trains leave the terminals around 5:33 AM. The last one leaves about 11:27 PM Sunday to Thursday and 1:30 AM on Friday and Saturday. The frequency stays at 9 min all day. When the metro closes the nMB1 night bus takes over.
The metro transfer stations are Termini (Lines A/B), San Giovanni (A/C), Colosseo (B/C), and Bologna (B/B1). At many stations, you’ll also find connections to buses, trams, and regional trains.