---
title: "Train Wi-Fi slow on Mac: test it, save data or use your hotspot · Kilobat Guides"
url: "https://kilobat.app/ko/guides/train-wifi-mac"
description: "Train Wi-Fi is shared by many passengers and drops along the route. Test it, get more from it, and know when your phone's hotspot is the better choice."
---

# Mac의 열차 Wi-Fi: 쓸 수 있게 하거나 내 핫스팟으로 바꾸기

Train Wi-Fi usually reaches the internet over mobile networks along the track. All the passengers share that connection, so it is often slow.

Applies to: All current macOS versions. Instant Hotspot needs an iPhone or a cellular iPad with the same Apple Account as the Mac. · 확인일: 2026년 10월 29일

## 증상

- The Mac joins and signs in, but pages load slowly or not at all.
- Calls freeze and uploads stop.
- The connection drops in tunnels and between stations, then comes back.
- The sign-in page appears again after some time.

## 가능한 원인

- **A shared connection.** The train's connection serves all its passengers. A full train leaves little speed for each device.
- **Gaps in mobile coverage.** Tunnels, cuttings and rural areas interrupt the mobile networks that the train uses.
- **Limits from the operator.** Some operators limit the speed, the data or the time for each device. Some block streaming.
- **The sign-in, a VPN or custom DNS.** Train Wi-Fi often has a sign-in page. A VPN or custom DNS can hide it, as on other public networks.
- **Background data on the Mac.** Sync, backups and updates use the same small connection as your work.

## 확인 방법

1. In a browser, open http://captive.apple.com. If the operator's page opens, sign in.
2. Run Apple's speed test. Write down the result.

   ```
   networkQuality
   ```
3. 현재 네트워크를 사용하는 프로세스를 확인합니다. 중지하려면 q를 누르세요.

   ```
   nettop -P -d
   ```
4. Look at the mobile signal on your phone. Strong signal and few passengers can make the hotspot faster.

## 해결 방법

1. Turn on Low Data Mode for the train network. Choose Apple menu > System Settings > Wi-Fi.
2. Click Details next to the train network. Turn on Low data mode. Click OK.
3. Pause sync, backups and updates until you are on a better network.
4. In calls, turn off your camera. Audio uses much less of the connection.
5. If the train Wi-Fi is too slow, click the Wi-Fi icon. Choose your iPhone under Personal Hotspot.
6. Run the same speed test on the hotspot. Keep the faster of the two.
7. To stop the Mac from going back to the train Wi-Fi, open its Details. Turn off Automatically join this network.
8. On the hotspot, pause the apps that use data in the background. See [Mac uses Personal Hotspot data in the background](https://kilobat.app/ko/guides/hotspot-background-data).
9. In tunnels and remote areas, the hotspot can drop too. Save your work before them.

## Kilobat 사용

1. Find which part is slow: Wi-Fi, the router, the internet, DNS or the sign-in page.

   ```
   kilobat diagnose
   ```
2. Check the sign-in page, and whether the network logged you out after an earlier sign-in.

   ```
   kilobat portal
   ```
3. Test the speed with a limit on the data that the test uses.

   ```
   kilobat speedtest --budget-mb 10
   ```
4. 앱별 실시간 업로드와 다운로드를 확인합니다. 중지하려면 q를 누르세요.

   ```
   kilobat status --watch
   ```
5. Mark the train network as metered. Kilobat then treats it like a hotspot.

   ```
   kilobat networks cost metered
   ```
6. For travel data packs, see [Working from anywhere with a Mac: eSIMs, phone hotspots and making data last](https://kilobat.app/ko/guides/work-from-anywhere-mac-mobile-data).

## 질문

**Is train Wi-Fi or my hotspot faster?**

It depends on the route, the time and your carrier. Test both with the same test, then keep the faster one.

**Does train Wi-Fi use my phone's data?**

No. Train Wi-Fi does not use your data plan. The Personal Hotspot does.

**Is train Wi-Fi safe for work?**

Pages with https hide their contents from the network. Turn on a VPN after you sign in, if your work needs one.

## 출처

- [Apple Developer 뉴스: 캡티브 네트워크를 현대화하는 방법(2020년 6월 22일)](https://developer.apple.com/news/?id=q78sq5rv)
- [Apple 지원: Mac의 Wi-Fi 설정](https://support.apple.com/guide/mac-help/wi-fi-settings-on-mac-mh11935/mac)
- [Apple 지원: iPhone 또는 iPad의 개인용 핫스팟에 연결하기](https://support.apple.com/en-us/111785)
- [Apple 지원: Instant Hotspot으로 개인용 핫스팟에 연결하기](https://support.apple.com/en-us/109321)
- [Apple Developer: NWPath isExpensive](https://developer.apple.com/documentation/network/nwpath/isexpensive)
- networkQuality(8) and nettop(1), man page installed with macOS 27.2

2026년 10월 29일 확인했습니다.

## 관련 가이드

- [Mac이 백그라운드에서 개인용 핫스팟 데이터 사용](https://kilobat.app/ko/guides/hotspot-background-data): 휴대전화 핫스팟에 연결된 Mac은 별다른 작업 없이도 많은 데이터를 사용할 수 있습니다.
- [Mac에 iPhone 핫스팟이 표시되지 않음](https://kilobat.app/ko/guides/instant-hotspot-not-showing): Instant Hotspot을 사용하면 Mac이 암호 없이 iPhone 또는 iPad 핫스팟에 연결할 수 있습니다.
- [Mac으로 어디서나 일하기: eSIM, 휴대전화 핫스팟과 데이터 절약](https://kilobat.app/ko/guides/work-from-anywhere-mac-mobile-data): 모바일 데이터를 사용하는 Mac은 여행용 데이터 팩을 며칠 만에 소진할 수 있습니다.
- [Mac에서 네트워크를 데이터 요금제 연결로 취급하기](https://kilobat.app/ko/guides/metered-network-mac): macOS는 iPhone 개인용 핫스팟 같은 일부 연결을 데이터 사용 비용이 높은 연결로 표시합니다.
- [Mac에서 저데이터 모드 사용하기](https://kilobat.app/ko/guides/low-data-mode-mac): 저데이터 모드는 해당 Wi-Fi 네트워크에서 macOS와 앱의 데이터 사용을 줄이도록 합니다.
- [Mac에서 Wi-Fi 로그인 페이지가 나타나지 않는 경우](https://kilobat.app/ko/guides/captive-portal-not-appearing): 공용 네트워크는 로그인 페이지에서 로그인할 때까지 모든 트래픽을 보류하는 경우가 많습니다.
- [Mac에서 영상 통화가 끊기거나 멈춤](https://kilobat.app/ko/guides/video-call-stutter-mac): 통화에는 빠른 속도보다 안정적인 지연 시간과 업로드가 더 중요합니다.