The Shinkansen service between Tokyo and Osaka (the Tokaido Line) is one of the most frequent and efficient high-speed rail lines in the world. During peak hours, the fastest service, the Nozomi, departs as often as every 5 to 10 minutes. When you include the slightly slower Hikari and Kodama services, there are often more than a dozen trains per hour. This "subway-like" frequency means you rarely need to stress about a specific schedule; you can simply show up at Tokyo Station or Shin-Osaka Station and find a train leaving shortly. The Nozomi takes about 2 hours and 30 minutes, while the Hikari takes roughly 3 hours. If you are using a Japan Rail Pass, remember that as of 2026, you can now use the Nozomi by paying a small supplemental fee, though the Hikari remains the standard "free" option for pass holders. Because the trains run so often, reserved seats are easy to get, but even unassigned "non-reserved" cars usually have plenty of space if you avoid the morning and evening rush hours.